Meet the tiny but mighty SoCal amphibian that may soon get endangered species protection

California’s Fish and Game Commission will soon consider designating the Western spadefoot as endangered.

The tiny amphibian is found in the grasslands of Southern California and the Central Valley. It has endured several challenges in recent decades, including habitat loss and prolonged drought.

But state endangered species protection could give the little frogs a break from the urban sprawl that threatens their habitats.

What’s a  Western spadefoot?

The animal resembles a toad but technically isn’t. It can fit in the palm of your hand and has bumpy skin. Spadefoots are short and stout and have a hard black spur on their back feet that they use to dig — hence the name.

Sofia Prado-Irwin, staff scientist at the from the Center for Biological Diversity, describes the Western spadefoot as “adorable” and “resilient.”

 ”The most charming feature that they have is they have really big eyes that are sort of situated pretty high up on the head, so they almost look like googly eyes,” Prado-Irwin said.

They breed in streams and vernal pools, temporary wetlands that pop up after rains. Once they reach adulthood, Western spadefoots hop to grasslands, where they like to burrow.

And to protect themselves from predators, their skin oozes a slime that smells like peanut butter. That scent is meant to trigger watery, itchy eyes and to irritate the nose, almost like a sneeze, granting the frog a chance to leap out of danger.

Why they might need more than peanut butter ooze for protection

Prado-Irwin says many of those complex habitats with vernal pools and grasslands or shrublands are hard to find now in California.

“There’s estimates in Southern California that 90 to 95% of those pool habitats that once existed don’t exist anymore,” Prado-Irwin said.

That’s because those areas have been paved over to make way for urban development and agricultural use.

Development can isolate populations of Western spadefoots. Prado-Irwin said that when vernal pools aren’t connected to grasslands, it can lead the amphibians to inbreed and cause the species to further decline.

That’s what has happened to the Western spadefoot in Orange County, where two clusters of spadefoots that are genetically distinct are small and isolated.

The backstory

Prado-Irwin said this isn’t the first time the Western spadefoot has been considered for protection.

In 2012, the species was petitioned for listing under the federal Endangered Species Act. In 2023 the U.S. Fish and Wildlife Service proposed to list the species as threatened but a decision wasn’t finalized.

The Center for Biological Diversity filed a petition in September 2025 asking for the state to list the Northern and Southern California populations of the species as threatened and endangered under state law.

That petition highlights development projects that could begin within the next few years that could affect the Western spadefoot’s habitat, including one in L.A. A proposed housing development called Northlake near Castaic Lake would pave over Grasshopper Creek. According to the Center for Biological Diversity, it would likely eliminate one of the last surviving populations of the Western spadefoot in the region.

Why it matters

Prado-Irwin said it’s important the state steps in to protect the species, as the Trump administration continues to weaken environmental protections, including the National Environmental Policy Act and the Clean Water Act.

And if there’s another reason to care about Western spadefoot, Prado-Irwin says, it’s because the amphibians are really good indicators of how the environment is doing:

“ When amphibian populations are doing well, that’s usually an indication that the environment is generally pretty healthy,” she said. “But once amphibians start declining, that's kind of a warning flag that we need to be looking at what's going on. Because usually that means there's bigger environmental problems.”

If the Western spadefoot eventually receives protection from the California Endangered Species Act, one upshot would be that development that could affect the species would require extensive reviews to mitigate harm to the amphibians.

Protection would also allow the California Department of Fish and Wildlife to start working to arrest the species’ decline and to help it recover.

What’s next

The California Fish and Game Commission will meet April 16 to discuss whether the Western spadefoot is a candidate for protection.